Natural Black onyx bracelets Measurements approx 7" but may vary slightly. Bracelet is banded with elastic. Beads are 8mm. Listing is for ONE bracelet About this gemstone: Black onyx has a calming quality, which can be beneficial in working with challenging emotions such as grief and anxiety. Black onyx also helps to balance yin and yang. It helps us to feel centered, make wise decisions, and get to the root cause of issues.